K.N.
my first thought was reflux as well. talk to the doctor, can't hurt to rule it out. I don't want you to be upset by this question, but are you burping her well? My husband doesn't burp my 8 month old if he falls asleep(never has) and well no matter how often I say something the baby spits up the minute he's laid down every time. Hubby's afraid to wake him up by burping him, but well, the spitting up wakes him up anyways and for a lot longer. :) Could also be the incline of the swing, it's possible that the more upright she is the less she will spit up.